MathX.

MathX features a useful tools such as calculators with special functions to help you quickly and easily calculate and solve your mathematical needs. The improved notes section also allows you to take notes right within the app with Markdown text and LaTeX support for a better note-taking experience. Additionally, MathX has tools like unit converters and binary converters which allows you to convert to and from different units, and the cheatsheets section now supports full PDF eNotes so you can refer to them whenever you need to.